$(document).ready( function() { 
  
  var navIndex = $.cookie('navIndex');
  
  $('.subnav').hide();
  
  if ( navIndex != null )
  	$('#nav li[id="' + navIndex + '"] .subnav').show();
  else
  	$('#nav .subnav a[href="'+window.location.pathname+'"]').closest('ul').show()
  
  $('#nav > li a').click( function() {
  	navIndex = $(this).closest('#nav li[id]').attr('id');
  	$.cookie('navIndex', navIndex);
    $(this).siblings('.subnav').slideToggle();
  });

});